All Things Mk5 > How to Guides / Troubleshooting

Cold start switch/sensor

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jimmy-s3:
Still having problems with my car from cold start up.......

Does anyone know which sensor/switch controls the cold start valve?? I want do disconnect it and see if my car drives any better from cold without the cold start not operating...

jimmy-s3:
Does this mean no one on this forum knows??

ub7rm:
I thought it just went off the coolant temp sender / lambda temp and the fuelling was adjusted until the cat was up to temp.  Could easily be wrong though  :rolleye:

Richn83:
I think its a relay someone posted up something about blower relay when joesgti was having cold start issues on his R32 could be worth a search for that thread as a starting point.

ub7rm:
The 1.8T had a secondary air injection system which involved pumping lots of air through the cat when it was cold - the R32 of a similar vintage (non FSI) might have the same thing but I think the FSI system did away with having to have this type of secondary air injection system in place ... again I stand ready to be corrected.

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